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RS( sA Immutable object representing a parsed IRI Reference.
Can be encoded into an URIReference object via the procedure
specified in RFC 3987 Section 3.1
.. note::
The IRI submodule is a new interface and may possibly change in
the future. Check for changes to the interface when upgrading.
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:param str iri_string: Unicode IRI to be parsed into a reference.
:param str encoding: The encoding of the string provided
:returns: :class:`IRIReference` or subclass thereof
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�S( s� Encode an IRIReference into a URIReference instance.
If the ``idna`` module is installed or the ``rfc3986[idna]``
extra is used then unicode characters in the IRI host
component will be encoded with IDNA2008.
:param idna_encoder:
Function that encodes each part of the host component
If not given will raise an exception if the IRI
contains a host component.
:rtype: uri.URIReference
:returns: A URI reference
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